﻿/*
 * This is a .NET port of the Apache Chemistry QueryParser. http://chemistry.apache.org/
 * The conversion was performed by Brügmann Software GmbH. Programmer: Björn Kremer.
 *
 * This project is still under the original Apache License: 
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace QueryParser
{
   using Tree =Antlr.Runtime.Tree.ITree;

   /// <summary>
   /// Base interface for a tree walker of a WHERE clause.
   /// <p>
   /// COntains only a single method used by the ANTLR query walker to
   /// initiate a tree walk for evaluating the query. You can inherit from
   /// this interface if you want to have your own walking mechanism
   /// <p>
   /// The method <seealso cref="walkClause"/> is the entry point.
   /// </summary>
   public interface PredicateWalkerBase
   {

      bool? walkPredicate(Tree whereNode);

   }
}
